Question

Can someone help me verify a trigonometic identity?

Answer 1

\[\frac{ \sin 3x }{ \sin x }=3-4\sin ^{2}x\]

Answer 2

\[\sin(u \pm v) = \sin u \cos v \pm \cos u \sin v\]
\[\sin(x + 2x) = \sin x \cos 2x + \cos x \sin 2x\]

Answer 3

Thanks for the help.

Answer 4

how do i end threads?
Can I just close it?